###############################################################################
## @file config.mk
## @author Y.M. Morgan
## @date 2011/05/14
###############################################################################

###############################################################################
## Make sure that there are no spaces in the absolute path; the build system
## can't deal with them.
###############################################################################

ifneq ("$(words $(shell pwd))","1")
$(error Top directory contains space characters)
endif

###############################################################################
## Host/Target OS.
###############################################################################

# Host OS
ifneq ("$(shell echo $$OSTYPE | grep msys)","")
  HOST_OS := MINGW32
  HOST_EXE_SUFFIX := .exe
  HOST_SHARED_LIB_SUFFIX := .dll
else
  HOST_OS := Linux
  HOST_EXE_SUFFIX :=
  HOST_SHARED_LIB_SUFFIX := .so
endif

# Target OS : default to HOST_OS unless set
ifndef TARGET_OS
  TARGET_OS := $(HOST_OS)
endif

# Exe/dll suffix under mingw
TARGET_STATIC_LIB_SUFFIX := .a
ifeq ("$(TARGET_OS)","MINGW32")
  DIR_SUFFIX := _mingw32
  TARGET_EXE_SUFFIX := .exe
  TARGET_SHARED_LIB_SUFFIX := .dll
else
  DIR_SUFFIX :=
  TARGET_EXE_SUFFIX :=
  TARGET_SHARED_LIB_SUFFIX := .so
endif

ifeq ("$(TARGET_OS)","MINGW32")
  # may be overridden in make command line
  STATIC := 1
  TARGET_GLOBAL_CFLAGS += -D__MINGW_FEATURES__=0
  TARGET_GLOBAL_LDFLAGS += -Wl,--enable-auto-import
  ifeq ("$(STATIC)","1")
    TARGET_GLOBAL_LDFLAGS += -Wl,-Bstatic
  endif
endif

# To be able to use ccache with pre-complied headers, some env variables are required
CCACHE := 
ifeq ("$(CCACHE)","1")
  ifneq ("$(shell which ccache)","")
    CCACHE := CCACHE_SLOPPINESS=time_macros ccache
    TARGET_GLOBAL_CFLAGS += -fpch-preprocess
  endif
endif

# Pre-compiled header generation flag
ifneq ("$(CLANG)","1")
  TARGET_PCH_FLAGS := -c
else
  TARGET_PCH_FLAGS := -x c++-header
endif

# Architecture
#ifndef TARGET_ARCH
#  ifneq ("$(shell $(GCC) -dumpmachine | grep 64)","")
#    TARGET_ARCH := AMD64
#  else
#    TARGET_ARCH := X86
#  endif
#endif

# Update flags based on architecture
# 64-bit requires -fPIC to build shared libraries
#ifeq ("$(TARGET_ARCH)","AMD64")
#  TARGET_GLOBAL_CFLAGS += -m64 -fPIC
#else
#  TARGET_GLOBAL_CFLAGS += -m32
#endif

###############################################################################
## Variables based on DEBUG/STATIC.
###############################################################################

#ifeq ("$(DEBUG)","0")
#  TARGET_GLOBAL_CFLAGS += -O2 -g -DNDEBUG
#  TARGET_OUT_INTERMEDIATES := $(TOP_DIR)/build_gcc$(DIR_SUFFIX)/release
#  TARGET_OUT := $(TOP_DIR)/out_gcc$(DIR_SUFFIX)/release
#else
#  TARGET_GLOBAL_CFLAGS += -O0 -g -DDEBUG -D_DEBUG
#  TARGET_OUT_INTERMEDIATES := $(TOP_DIR)/build_gcc$(DIR_SUFFIX)/debug
#  TARGET_OUT := $(TOP_DIR)/out_gcc$(DIR_SUFFIX)/debug
#endif

###############################################################################
## Determine gcc path and version.
###############################################################################

GCC_PATH := $(shell which $(GCC))

ifneq ("$(CLANG)","1")
GCC_VERSION := $(shell $(GCC) --version | head -1 | sed "s/.*\([0-9]\.[0-9]\.[0-9]\).*/\1/")
else
GCC_VERSION := $(shell $(GCC) --version | head -1 | sed "s/.*\([0-9]\.[0-9]-[0-9]\).*/\1/")
endif